Generator Earthing
Generator Earthing
Generator Earthing
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Gen. 1<br />
Gen. 2<br />
Single point earthing<br />
50 mA<br />
Note that discrimination of earth leakage protection<br />
can normally only be achieved by using time delays.<br />
This is not compatible with personnel protection.<br />
Generally the generating set earth leakage protection<br />
should be delayed if possible.<br />
e/f<br />
Load<br />
Phase current<br />
Earth leakage current = 50 mA<br />
Gen 1 Earth path current<br />
Gen 2 Earth path current<br />
CT current<br />
The earth leakage protection on Gen. 1<br />
is arranged to intertrip both generators.<br />
There are no shared current paths and<br />
no circulating current therefore exists in<br />
the earth path.<br />
The set neutrals are interconnected<br />
and three pole circuit breakers are<br />
used.<br />
The earth leakage protection ignores<br />
any circulating current in the neutral<br />
paths.
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